using System;

namespace nHydrate.EFCore.DataAccess
{
	/// <summary>
	/// This is the paging class to specify settings for paging operations
	/// </summary>
	[Serializable]
	public partial class Paging : nHydrate.EFCore.DataAccess.IPaging
	{
		#region Class Members

		private const int _def_pageIndex = 1;
		private const int _def_recordsperPage = 10;

		private int _pageIndex = _def_pageIndex;
		private int _recordsperPage = _def_recordsperPage;

		#endregion

		#region Constructors

		/// <summary>
		/// Creates a paging object
		/// </summary>
		public Paging()
			: this(_def_pageIndex, _def_recordsperPage)
		{
		}

		/// <summary>
		/// Creates a paging object
		/// </summary>
		/// <param name="pageIndex">The page index to load [1..N]</param>
		/// <param name="recordsperPage">The number of records per page.</param>
		public Paging(int pageIndex, int recordsperPage)
		{
			_pageIndex = pageIndex;
			_recordsperPage = recordsperPage;
		}

		#endregion

		#region Property Implementations

		/// <summary>
		/// The page number of load.
		/// </summary>
		public int PageIndex
		{
			get { return _pageIndex; }
			set
			{
				if (value < 1) throw new Exception("The PageIndex must be 1 or greater.");
				_pageIndex = value;
			}
		}

		/// <summary>
		/// The number of items per page.
		/// </summary>
		public int RecordsperPage
		{
			get { return _recordsperPage; }
			set
			{
				if (value < 1) throw new Exception("The RecordsperPage must be 1 or greater.");
				_recordsperPage = value;
			}
		}

		/// <summary>
		/// After the paged set is retrieved, this value is the total number of pages based on the filter
		/// </summary>
		public int PageCount { get; set; }

		/// <summary>
		/// The total number of non-paged items returned for the search.
		/// </summary>
		public int RecordCount { get; set; }

		#endregion

	}

}